• Tom Herbert's avatar
    inet: Fix get port to handle zero port number with soreuseport set · 0643ee4f
    Tom Herbert authored
    A user may call listen with binding an explicit port with the intent
    that the kernel will assign an available port to the socket. In this
    case inet_csk_get_port does a port scan. For such sockets, the user may
    also set soreuseport with the intent a creating more sockets for the
    port that is selected. The problem is that the initial socket being
    opened could inadvertently choose an existing and unreleated port
    number that was already created with soreuseport.
    
    This patch adds a boolean parameter to inet_bind_conflict that indicates
    rather soreuseport is allowed for the check (in addition to
    sk->sk_reuseport). In calls to inet_bind_conflict from inet_csk_get_port
    the argument is set to true if an explicit port is being looked up (snum
    argument is nonzero), and is false if port scan is done.
    Signed-off-by: default avatarTom Herbert <tom@herbertland.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    0643ee4f
inet6_connection_sock.h 1.11 KB